text: //
  //  YTKChainRequest.h
  //
  //  Copyright (c) 2012-2014 YTKNetwork https://github.com/yuantiku
  //
  //  Permission is hereby granted, free of charge, to any person obtaining a copy
  //  of this software and associated documentation files (the "Software"), to deal
  //  in the Software without restriction, including without limitation the rights
  //  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  //  copies of the Software, and to permit persons to whom the Software is
  //  furnished to do so, subject to the following conditions:
  //
  //  The above copyright notice and this permission notice shall be included in
  //  all copies or substantial portions of the Software.
  //
  //  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  //  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  //  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  //  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  //  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  //  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  //  THE SOFTWARE.
  
  #import <Foundation/Foundation.h>
  #import "YTKBaseRequest.h"
  
  @class YTKChainRequest;
  @protocol YTKChainRequestDelegate <NSObject>
  
  - (void)chainRequestFinished:(YTKChainRequest *)chainRequest;
  
  - (void)chainRequestFailed:(YTKChainRequest *)chainRequest failedBaseRequest:(YTKBaseRequest*)request;
  
  @end
  
  typedef void (^ChainCallback)(YTKChainRequest *chainRequest, YTKBaseRequest *baseRequest);
  
  @interface YTKChainRequest : NSObject
  
  @property (weak, nonatomic) id<YTKChainRequestDelegate> delegate;
  
  @property (nonatomic, strong) NSMutableArray *requestAccessories;
  
  /// start chain request
  - (void)start;
  
  /// stop chain request
  - (void)stop;
  
  - (void)addRequest:(YTKBaseRequest *)request callback:(ChainCallback)callback;
  
  - (NSArray *)requestArray;
  
  /// Request Accessory，可以hook Request的start和stop
  - (void)addAccessory:(id<YTKRequestAccessory>)accessory;
  
  @end
  